Auto: abcip-3.3 — read-strategy selector (WholeUdt / MultiPacket / Auto)

Closes #237

src/ZB.MOM.WW.OtOpcUa.Driver.AbCip/AbCipDriverFactoryExtensions.cs

@@ -40,7 +40,10 @@ public static class AbCipDriverFactoryExtensions
                     DeviceName: d.DeviceName,
                     ConnectionSize: d.ConnectionSize,
                     AddressingMode: ParseEnum<AddressingMode>(d.AddressingMode, "device", driverInstanceId,
-                        "AddressingMode", fallback: AddressingMode.Auto)))]
+                        "AddressingMode", fallback: AddressingMode.Auto),
+                    ReadStrategy: ParseEnum<ReadStrategy>(d.ReadStrategy, "device", driverInstanceId,
+                        "ReadStrategy", fallback: ReadStrategy.Auto),
+                    MultiPacketSparsityThreshold: d.MultiPacketSparsityThreshold ?? 0.25))]
                 : [],
             Tags = dto.Tags is { Count: > 0 }
                 ? [.. dto.Tags.Select(t => BuildTag(t, driverInstanceId))]
@@ -137,6 +140,23 @@ public static class AbCipDriverFactoryExtensions
         ///     Micro800 / SLC500 / PLC5 falls back to Symbolic with a warning.
         /// </summary>
         public string? AddressingMode { get; init; }
+
+        /// <summary>
+        ///     PR abcip-3.3 — optional per-device read-strategy override. <c>"Auto"</c>,
+        ///     <c>"WholeUdt"</c>, or <c>"MultiPacket"</c>. Defaults to <c>Auto</c> (the planner
+        ///     picks per-batch using <see cref="MultiPacketSparsityThreshold"/>). Family
+        ///     compatibility is enforced at <see cref="AbCipDriver.InitializeAsync"/>: explicit
+        ///     <c>MultiPacket</c> against Micro800 (no
+        ///     <see cref="PlcFamilies.AbCipPlcFamilyProfile.SupportsRequestPacking"/>) falls
+        ///     back to <c>WholeUdt</c> with a warning.
+        /// </summary>
+        public string? ReadStrategy { get; init; }
+
+        /// <summary>
+        ///     PR abcip-3.3 — sparsity-threshold knob applied when <see cref="ReadStrategy"/>
+        ///     resolves to <c>Auto</c>. Default <c>0.25</c>; clamped to <c>[0..1]</c>.
+        /// </summary>
+        public double? MultiPacketSparsityThreshold { get; init; }
     }
 
     internal sealed class AbCipTagDto